Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards (Replaces 6CE-W0078-01-00)
Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards (Replaces 6CE-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards (Re...
Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards (Replaces 6CE-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards (Replaces 6CE-W0078-01-00, 6CE-W0078-02-00) provides all necessary components for a complete service of the lower unit's water pump assembly. It is designed for Yamaha 4-Stroke 225–300 HP F225, F250, F300, and VF250 4.2L V6 outboard engines from 2007 to 2015.
This kit serves as a direct replacement for Yamaha OEM part numbers 6CE-W0078-00-00, 6CE-W0078-01-00, and 6CE-W0078-02-00, as well as Sierra aftermarket parts 18-3470 and 18-3471.
- Installs in the lower unit to restore cooling system performance.
- Includes all essential gaskets, seals, and hardware for a full rebuild.
- Engineered for Yamaha 4.2L V6 outboard applications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6CE-W0078-00-00 |
| Yamaha | 6CE-W0078-01-00 |
| Yamaha | 6CE-W0078-02-00 |
| Sierra | 18-3470 |
| Sierra | 18-3471 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for select Yamaha V6 4.2L four-stroke models. Please verify your specific engine model and year against this list.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | F225 | 225 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | F250 | 250 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | FL250 | 250 | 4-Stroke | 2010 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF225 | 225 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF250 | 250 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | VF250 | 250 | 4-Stroke | 2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | F300 | 300 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | FL300 | 300 | 4-Stroke | 2010 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF300 | 300 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | F350 | 350 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | FL350 | 350 | 4-Stroke | 2010 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF350 | 350 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
Technical Specs
- Product Type
- Water Pump Repair Kit / Impeller Kit
- Installation
- Lower Unit
- Warranty
- 1-year (aftermarket)
- Other Technical Attributes
- For lower unit water pump assembly
What’s in the Box
- 1 x Impeller (6CE-44352-00-00)
- 1 x Key/Woodruff Key (90280-04M05-00/90280-04002-00)
- 1 x O-Ring (93210-94003-00)
- 4 x Bolt (97095-08045-00/90119-08191-00)
- 2 x Seal, Oil (93104-22M07-00)
- 1 x Insert/Cartridge (6AW-44322-00-00)
- 1 x Outer Plate/Cartridge Plate (6CE-44323-01-00)
- 1 x Water Pump Gasket (6CE-44315-00-00)
- 2 x Dowel Pin (93606-12019-00)
- 1 x O-Ring (93210-37M67-00)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Drain the gearcase oil from the lower unit.
- Remove the bolts securing the lower unit to the midsection and carefully lower it.
- Unbolt and remove the old water pump housing assembly.
- Clean the mounting surfaces and driveshaft area thoroughly.
- Install the new woodruff key, impeller, seals, and O-rings from the kit.
- Install the new insert, cup, and plate into the housing.
- Slide the new housing assembly down the driveshaft and secure it with the new bolts, tightening them to the manufacturer's specified torque.
- Re-install the lower unit, refill with fresh gear oil, and reconnect the battery before testing.
Troubleshooting & FAQ
How do I verify this kit fits my specific outboard?
This kit is specifically designed for Yamaha 4.2L V6 F225, F250, F300, and VF250 models from 2007–2015. Always check your engine's model number and year against our compatibility chart before ordering.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "tell-tale" indicator outlet, and a steam-like exhaust. Reduced engine power can also occur as the ECU attempts to protect the engine from heat damage.
How often should I replace my outboard's water pump kit?
For preventative maintenance, it is recommended to service the water pump every 1 to 2 years or 100-200 hours of operation, whichever comes first. Service intervals should be shorter for boats used in saltwater or in water with high levels of sand and silt.
Are special tools required for this installation?
Standard marine mechanic tools, including a socket set, screwdrivers, and pliers, are required. A torque wrench is highly recommended to ensure all bolts are tightened to OEM specifications, preventing leaks and damage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
